**Core Concept**
Incremental border moulding is a technique used in dentistry to create a custom-fitting dental prosthesis, particularly in removable partial dentures. The material of choice should have adequate strength, durability, and ability to be shaped and molded to achieve a precise fit.

**Why the Correct Answer is Right**
The material of choice for incremental border moulding is **autopolymerizing acrylic resin**. This type of resin is widely used in dentistry due to its ease of manipulation, ability to be shaped and molded, and relatively low cost. When mixed with a liquid monomer, it undergoes a chemical reaction that causes it to harden, allowing the dentist to create a precise border moulding.

**Why Each Wrong Option is Incorrect**
**Option A:** **Epoxy resin** is too brittle and prone to cracking, making it unsuitable for incremental border moulding.
**Option B:** **Dental composite resin** is too hard and difficult to shape, and its high viscosity makes it challenging to achieve a precise fit.
**Option C:** **Silicone impression material** is too soft and may not provide a precise border moulding, and it may also be difficult to remove from the mouth.

**Clinical Pearl / High-Yield Fact**
Autopolymerizing acrylic resin is commonly used in dentistry due to its ease of manipulation and ability to be shaped and molded to achieve a precise fit. It is essential to mix the resin and liquid monomer according to the manufacturer's instructions to achieve optimal results.

**Correct Answer: C. Autopolymerizing acrylic resin**